August Season: Cutting the Wire
Three boxes, three severed paths — DNS, firewall rules, and a route that was never supposed to disappear. Someone made sure nothing connected the way it should before they left. Trace each break, repair it properly, and recover what's waiting on the other side. All on sandboxes you fully control. Defensive practice only.
Archived season — playable for practice, no leaderboard points. Official write-ups are open.
DNS: The Parting Shot
forensics · dns · networking
Firewall: The Rule They Slipped In
forensics · firewall · nftables
Reach the Evidence Server
forensics · networking · dns
Reach the Evidence Server
400 pts · decays to 180 · +75 first bloodBefore they left, whoever had access cut off every path to the evidence collector on the response subnet: the name doesn't resolve, the route to that subnet is gone, and the one firewall rule that mattered got overridden by a DROP. None of it looks deliberate at first glance — that's the point. Rebuild the path layer by layer and recover what's waiting once you're actually connected.
The live sandbox for this challenge isn't available yet — the brief is open.
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Submit flag
Complete every objective in the lab and use Verify & grade, then submit the flag from that same box here.
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Archived — solves are for practice, not the leaderboard.
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